Day: September 22, 2021

Equinox on a Spinning Earth

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When does the line between night and day become vertical? Today. Today is an equinox on planet Earth, a time of year when day and night are most nearly equal. At an equinox, the Earth’s terminator — the dividing line between day and night — becomes vertical and connects the north and south poles. The featured time-lapse video demonstrates this by displaying an entire year on planet Earth in twelve seconds. From geosynchronous orbit, the Meteosat 9 satellite recorded these infrared images of the Earth every day at the same local time. The video started at the September 2010 equinox with the terminator line being vertical. As the Earth revolved around the Sun, the terminator was seen to tilt in a way that provides less daily sunlight to the northern hemisphere, causing winter in the north. As the year progressed, the March 2011 equinox arrived halfway through the video, followed by the terminator tilting the other way, causing winter in the southern hemisphere — and summer in the north. The captured year ends again with the September equinox, concluding another of billions of trips the Earth has taken — and will take — around the Sun. via NASA https://ift.tt/3CBp332

Wikipedia article of the day for September 22, 2021

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Wikipedia article of the day is The Triumph of Cleopatra. Check it out: Article-Link Summary: The Triumph of Cleopatra is an oil painting by the English artist William Etty, depicting a scene from Plutarch’s Life of Antony and Shakespeare’s Antony and Cleopatra, in which Cleopatra, Queen of Egypt, voyages to Tarsus to cement an alliance with the Roman general Mark Antony. The painting shows a large group of people in various states of nudity, watching her ship’s arrival. First exhibited at the Royal Academy Summer Exhibition in 1821, the painting was an immediate success and made the then-obscure Etty famous almost overnight. Although some commentators considered it offensive and indecent, the painting’s success prompted Etty to spend the next decade painting further history paintings containing nude figures, becoming well known for combining these with moral messages.